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Membrane insertases at a glance.

Büsra Kizmaz1, Johannes M Herrmann1

  • 1Cell Biology, University of Kaiserslautern, Kaiserslautern 67663, Germany.

Journal of Cell Science
|July 7, 2023
PubMed
Summary
This summary is machine-generated.

Protein translocases and membrane insertases are crucial for protein transport and integration into cellular membranes. This includes Oxa1-type and BamA-family proteins, essential for diverse cellular functions and protein topogenesis.

Keywords:
BAM complexEMC complexGET complexMembrane insertasesOxa1Protein biogenesisTranslocasesYidCβ-barrel proteins

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein translocases (e.g., bacterial SecY, ER Sec61, mitochondrial translocases) transport proteins across membranes.
  • These translocases also facilitate the insertion of integral membrane proteins into lipid bilayers.
  • Membrane insertases work with translocases to ensure proper topogenesis, folding, and assembly of membrane proteins.

Purpose of the Study:

  • To provide an overview of Oxa1 and BamA family membrane insertases.
  • To discuss the distinct functions of these insertases in integrating proteins with different structures.
  • To highlight the roles of Oxa1-type insertases in the endoplasmic reticulum (ER) and other cellular compartments.

Main Methods:

  • Review of existing literature and recent studies on membrane insertases.
  • Analysis of the structural and functional roles of Oxa1 and BamA families.
  • Comparison of insertase mechanisms across different cellular membranes (bacteria, ER, mitochondria, chloroplasts).

Main Results:

  • Oxa1 family proteins integrate proteins with alpha-helical transmembrane domains.
  • BamA family proteins integrate beta-barrel proteins into lipid bilayers.
  • Oxa1-type insertases are found in ER membrane protein complex (EMC), guided entry of tail-anchored (GET), and GET- and EMC-like (GEL) complexes.

Conclusions:

  • Oxa1 and BamA families represent the core components of major membrane insertase classes.
  • These insertases are vital for the correct integration and assembly of membrane proteins.
  • Recent findings expand the known roles of Oxa1-type insertases, particularly within the ER.